Leaking isn't just annoying—it can damage your belongings. And heat? If you leave a cheap counterfeit in a hot car, you're asking for trouble. Genuine devices undergo quality control to handle temperature swings. Fakes? Not so much. I've seen counterfeit units that warp or even expand in heat. That's a safety hazard.

So what do you do? Stick to authorized retailers. If you're buying online, check the seller's reputation and avoid deals that seem impossibly low. A $5 disposable that's supposed to last 15,000 puffs? Yeah, that's a fake.